[This was found while debugging why SELinux "sandbox -X" doesn't work on my machine]
kernel-2.6.35.4-12.fc14.i686
xorg-x11-server-Xephyr-1.9.0-4.fc14.i686
1. disable IPv6 module loading
Either add a file to /etc/modprobe.d with
install ipv6 /bin/true
or
blacklist ipv6
+ disable all services that might set up ipv6, e.g. ip6tables
2. after boot make sure that "ipv6" isn't loaded:
# lsmod | fgrep ipv6
#
3. SELinux can be in Enforced or Permissive mode
This only affects what kind of AVCs you'll receive. It hasn't anything to do with the problem.
4. start Xephyr
(this is the command line used by sandbox -X)
$ /usr/bin/Xephyr -title "test" -terminate -screen 1024x768 -displayfd 5
_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/l3f1199:0
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/l3f1199:1
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6
_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/l3f1199:2
...
... and so on and so on ...
...
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet
_XSERVTransSocketOpenCOTSServer: Unable to open socket for local
_XSERVTransOpen: transport open failed for local/l3f1199:64510
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for local
_XSERVTransSocketOpenCOTSServer: Unable to open socket for unix
_XSERVTransOpen: transport open failed for unix/l3f1199:64510
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for unix
Fatal server error:
Failed to find a socket to listen on

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